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    UnisonSync brings the Unison File Synchronizer - a powerful cross-platform file synchronization tool - to Android!

    UnisonSync allows you to use Unison without having to use it from the command line. Root is not required.

    Unison is a powerful cross-platform file synchronization tool available on Linux, OS X, Windows, etc. Unison takes two roots, that can be on different machines and can be modified separately, and brings them up to date by smartly propagating the changes between the roots.

    The key features of Unison are:
    - Synchronization between different platforms
    - Handles simultaneous updates to both roots
    - Smart and safe: Unison resolves most simultaneous changes on both roots automatically, and prompts the user for input if it cannot determine the copy to propagate
    - Synchronization to a server over SSH: any machine with an SSH server and Unison can act as server
    - Resilient: handles interruptions, network disconnections, etc.
    - Bandwidth efficient: the data is transfered by a compressed protocol similar to rsync, and only modified files (or parts of files) are transferred.

    As an Android application, UnisonSync hides all the complexities of using Unison on the command line.
    UnisonSync allows:
    - to generate the public/private keys (using the included OpenSSH) to allow the Android device to connect to the SSH server against which you want .
    - to configure the roots and unison parameters (fully manually configurable as well; one profile or synchronization directory at a time only).
    - to launch the synchronization (which requires a button press! hint to Tasker users). Synchronization then happens in the background as an Android service. Once the synchronization is over or if user input is needed a notification pops up.
    - to browse through Unison's command line output

    - Only for ARM devices

    UnisonSync comprises binaries of Unison and OpenSSH compiled from the existing open-source repositories (see acknowledgements).
    Binaries are packaged alongside UnisonSync's APK, but UnisonSync does not actually link against these unmodified apps.
    Therefore UnisonSync does not violate the GPL license.


    - Benjamin Pierce et al.'s Unison File Synchronizer (
    - Keigo Imai's patch to to cross-compile OCaml on Android (
    - Jérôme Vouillon's OPAM Android repository (
    - Matt Johnston's Dropbear SSH client (

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